Spain Population 2025 By Religion. The most popular religion is christianity, followed by an estimated 2.38 billion people worldwide. According to the data provided, the current population of spain as of 2025 is 47,558,630.

Two predominantly catholic countries, italy and spain, have some of the smallest average completed family size (1.3 children and 1.2 children per woman respectively) in the. The resident population in spain increased by 67,367 persons in the second quarter and stood at 48,797,875 inhabitants as of 1 july, 2025.